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Crawl space vent to outside - can I seal it?

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Crawl space vent to outside - can I seal it? Mulan 10-12-2006
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Posted by Mulan on October 12, 2006, 1:07 am


I pulled up the floor to the crawl space just in the back part of the
house to put black plastic down and insulate it and I found a one foot
square hole to the outside and the air coming in is FREEZING. There is
a half basement with a small window and another small vent about 7
inches in diameter under another room next to the big freezing one.
The house was build in 1900.

Can I seal up that airspace or put insulation over it? It also has a
grating outside on the ground and I bet when it is raining that water
gets in too.

What are my options?
Thank you


AppliancePartsPros.com, Inc.
Posted by buffalobill on October 12, 2006, 1:57 am


it may provide fresh air required for combustion in heating.

Mulan wrote:
> I pulled up the floor to the crawl space just in the back part of the
> house to put black plastic down and insulate it and I found a one foot
> square hole to the outside and the air coming in is FREEZING. There is
> a half basement with a small window and another small vent about 7
> inches in diameter under another room next to the big freezing one.
> The house was build in 1900.
>
> Can I seal up that airspace or put insulation over it? It also has a
> grating outside on the ground and I bet when it is raining that water
> gets in too.
>
> What are my options?
> Thank you


Posted by peter on October 12, 2006, 6:36 am


>I pulled up the floor to the crawl space just in the back part of the
> house to put black plastic down and insulate it and I found a one foot
> square hole to the outside and the air coming in is FREEZING. There is
> a half basement with a small window and another small vent about 7
> inches in diameter under another room next to the big freezing one.
> The house was build in 1900.
>
> Can I seal up that airspace or put insulation over it? It also has a
> grating outside on the ground and I bet when it is raining that water
> gets in too.
>
> What are my options?

the vent is to allow moisture to leave, and dirt tends to become moist
on the other hand, there are people who argue that crawlspace vents should
be sealed and moisture problem handled with sump pump. in fact there are
companies whose business is to seal up your crawlspace



Posted by on October 12, 2006, 7:02 am



peter wrote:
> >I pulled up the floor to the crawl space just in the back part of the
> > house to put black plastic down and insulate it and I found a one foot
> > square hole to the outside and the air coming in is FREEZING. There is
> > a half basement with a small window and another small vent about 7
> > inches in diameter under another room next to the big freezing one.
> > The house was build in 1900.
> >
> > Can I seal up that airspace or put insulation over it? It also has a
> > grating outside on the ground and I bet when it is raining that water
> > gets in too.
> >
> > What are my options?
>
> the vent is to allow moisture to leave, and dirt tends to become moist
> on the other hand, there are people who argue that crawlspace vents should
> be sealed and moisture problem handled with sump pump. in fact there are
> companies whose business is to seal up your crawlspace


How in the world do you handle crawl space humidity with a sump pump?
Wait till there is 6 inchs of water, then pump it out?


Posted by Eric in North TX on October 12, 2006, 8:13 am



What I've always done is; cover them after the first frost & open them
up after the final thaw. I may misjudge the final thaw, but this isn't
rocket science, I may even wait till it hits 80 degrees out. I bought
some automatic vents that have a bi-metal spring to open & close them
at a set temperature. I haven't installed them yet, but they will free
up 5 minutes a year.


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